患儿男，6岁，因发热、畏寒1周来急诊。査体：精神面色差，皮肤有少量瘀点，无黄染及发绀，胸骨左缘第3-4肋间有全收缩期杂音，伴震颤，肝肋下2cm,脾肋下lcm,Hb100g/L,WBC18x109/L,N0.80,L0.20。诊断考虑为

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